Effect of Cellular Structure on Mechanical Properties of Polyurethane Foam Curing Materials

郑新国^1,2，LIU Yaxun³，ZHANG Jinyong¹，REN Lin³，王为民¹

1. School of Materials Science and Engineering, Wuhan University of Technology2. Railway Engineering Research Institute, China Academy of Railway Sciences Co., Ltd.3. School of Science, Wuhan University of Technology

摘 要：Based on the mechanical properties and microstructure of polyurethane foam solidified material, a two-dimensional model of polyurethane foam solidified material was constructed. Polyurethane foam was obtained by fully and uniformly mixing the two components. The research was carried out through the combination of experimental test and finite element simulation. The experimental results show that when the pore density is constant, the size of the bubble hole is an important factor affecting the mechanical properties of the model. The smaller the size of the bubble hole, the less likely it is to produce stress concentration inside the model, and the stronger the resistance to material deformation. Under the random distribution, the lower the density of the polyurethane cured material, the higher the probability of damage between the adjacent bubbles, which is not conducive to the stability of the material. The density of the cured material should not be lower than 199 kg/m³.

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